DeriveParameters overwrites any existing parameter information for the SqlDbCommand.

DeriveParameters requires an additional call to the database to obtain the information. If the parameter information is known in advance, it is more efficient to populate the parameters collection by setting the information explicitly.

You can only use DeriveParameters with stored procedures. You cannot use DeriveParameters with extended stored procedures. You cannot use DeriveParameters to populate the SqlParameterCollection with arbitrary Transact-SQL statements, such as a parameterized SELECT statement.